/Engine/Source/Developer/TraceServices/Public/TraceServices/Model/AllocationsProvider.h
Returns the inclusive index range [StartIndex, EndIndex] for a time range [StartTime, EndTime].Indexvalues are in range { -1, 0, .. , N-1, N }, where N =GetTimelineNumPoints().
void GetTimelineIndexRange ( double StartTime, double EndTime, int32 & StartIndex, int32 & EndIndex ) const